Hikari Jindou

Jindou is one of the main characters of the manga, a very sincere and over the top girl who will do anything in her power to have Kou choose her over his childhood friend, to the point of always sexually arousing/seducing Kou.
It is implied that she isn't human, and that the power Ayumi has was originally hers, she can take the power back at will if she deems so, but doesn't want to as much as possible since in doing so, Ayumi would die again.